udev_rules.c

   1 /*
   2  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for more details.
  13  *
  14  *      You should have received a copy of the GNU General Public License along
  15  *      with this program; if not, write to the Free Software Foundation, Inc.,
  16  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *
  18  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <ctype.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <syslog.h>
  29 #include <fnmatch.h>
  30 #include <sys/wait.h>
  31 #include <sys/stat.h>
  32
  33 #include "udev.h"
  34 #include "udev_rules.h"
  35
  36
  37 /* extract possible {attr} and move str behind it */
  38 static char *get_format_attribute(char **str)
  39 {
  40         char *pos;
  41         char *attr = NULL;
  42
  43         if (*str[0] == '{') {
  44                 pos = strchr(*str, '}');
  45                 if (pos == NULL) {
  46                         err("missing closing brace for format");
  47                         return NULL;
  48                 }
  49                 pos[0] = '\0';
  50                 attr = *str+1;
  51                 *str = pos+1;
  52                 dbg("attribute='%s', str='%s'", attr, *str);
  53         }
  54         return attr;
  55 }
  56
  57 /* extract possible format length and move str behind it*/
  58 static int get_format_len(char **str)
  59 {
  60         int num;
  61         char *tail;
  62
  63         if (isdigit(*str[0])) {
  64                 num = (int) strtoul(*str, &tail, 10);
  65                 if (num > 0) {
  66                         *str = tail;
  67                         dbg("format length=%i", num);
  68                         return num;
  69                 } else {
  70                         err("format parsing error '%s'", *str);
  71                 }
  72         }
  73         return -1;
  74 }
  75
  76 static int get_key(char **line, char **key, char **value)
  77 {
  78         char *linepos;
  79         char *temp;
  80
  81         linepos = *line;
  82         if (linepos == NULL)
  83                 return -1;
  84
  85         /* skip whitespace */
  86         while (isspace(linepos[0]))
  87                 linepos++;
  88
  89         /* get the key */
  90         temp = strchr(linepos, '=');
  91         if (temp == NULL || temp == linepos)
  92                 return -1;
  93         temp[0] = '\0';
  94         *key = linepos;
  95         linepos = &temp[1];
  96
  97         /* get a quoted value */
  98         if (linepos[0] == '"' || linepos[0] == '\'') {
  99                 temp = strchr(&linepos[1], linepos[0]);
 100                 if (temp != NULL) {
 101                         temp[0] = '\0';
 102                         *value = &linepos[1];
 103                         goto out;
 104                 }
 105         }
 106
 107         /* get the value*/
 108         temp = strchr(linepos, '\n');
 109         if (temp != NULL)
 110                 temp[0] = '\0';
 111         *value = linepos;
 112 out:
 113         return 0;
 114 }
 115
 116 static int import_keys_into_env(struct udevice *udev, const char *buf, size_t bufsize)
 117 {
 118         char line[LINE_SIZE];
 119         const char *bufline;
 120         char *linepos;
 121         char *variable;
 122         char *value;
 123         size_t cur;
 124         size_t count;
 125         int lineno;
 126
 127         /* loop through the whole buffer */
 128         lineno = 0;
 129         cur = 0;
 130         while (cur < bufsize) {
 131                 count = buf_get_line(buf, bufsize, cur);
 132                 bufline = &buf[cur];
 133                 cur += count+1;
 134                 lineno++;
 135
 136                 if (count >= sizeof(line)) {
 137                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
 138                         continue;
 139                 }
 140
 141                 /* eat the whitespace */
 142                 while ((count > 0) && isspace(bufline[0])) {
 143                         bufline++;
 144                         count--;
 145                 }
 146                 if (count == 0)
 147                         continue;
 148
 149                 /* see if this is a comment */
 150                 if (bufline[0] == COMMENT_CHARACTER)
 151                         continue;
 152
 153                 memcpy(line, bufline, count);
 154                 line[count] = '\0';
 155
 156                 linepos = line;
 157                 if (get_key(&linepos, &variable, &value) == 0) {
 158                         dbg("import '%s=%s'", variable, value);
 159
 160                         /* handle device, renamed by external tool, returning new path */
 161                         if (strcmp(variable, "DEVPATH") == 0) {
 162                                 info("updating devpath from '%s' to '%s'", udev->dev->devpath, value);
 163                                 sysfs_device_set_values(udev->dev, value, NULL, NULL);
 164                         } else
 165                                 name_list_key_add(&udev->env_list, variable, value);
 166                         setenv(variable, value, 1);
 167                 }
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int import_file_into_env(struct udevice *udev, const char *filename)
 174 {
 175         char *buf;
 176         size_t bufsize;
 177
 178         if (file_map(filename, &buf, &bufsize) != 0) {
 179                 err("can't open '%s': %s", filename, strerror(errno));
 180                 return -1;
 181         }
 182         import_keys_into_env(udev, buf, bufsize);
 183         file_unmap(buf, bufsize);
 184
 185         return 0;
 186 }
 187
 188 static int import_program_into_env(struct udevice *udev, const char *program)
 189 {
 190         char result[2048];
 191         size_t reslen;
 192
 193         if (run_program(program, udev->dev->subsystem, result, sizeof(result), &reslen, (udev_log_priority >= LOG_INFO)) != 0)
 194                 return -1;
 195         return import_keys_into_env(udev, result, reslen);
 196 }
 197
 198 static int import_parent_into_env(struct udevice *udev, const char *filter)
 199 {
 200         struct sysfs_device *dev_parent;
 201         int rc = -1;
 202
 203         dev_parent = sysfs_device_get_parent(udev->dev);
 204         if (dev_parent != NULL) {
 205                 struct udevice *udev_parent;
 206                 struct name_entry *name_loop;
 207
 208                 dbg("found parent '%s', get the node name", dev_parent->devpath);
 209                 udev_parent = udev_device_init(NULL);
 210                 if (udev_parent == NULL)
 211                         return -1;
 212                 /* import the udev_db of the parent */
 213                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 214                         dbg("import stored parent env '%s'", udev_parent->name);
 215                         list_for_each_entry(name_loop, &udev_parent->env_list, node) {
 216                                 char name[NAME_SIZE];
 217                                 char *pos;
 218
 219                                 strlcpy(name, name_loop->name, sizeof(name));
 220                                 pos = strchr(name, '=');
 221                                 if (pos) {
 222                                         pos[0] = '\0';
 223                                         pos++;
 224                                         if (fnmatch(filter, name, 0) == 0) {
 225                                                 dbg("import key '%s'", name_loop->name);
 226                                                 name_list_add(&udev->env_list, name_loop->name, 0);
 227                                                 setenv(name, pos, 1);
 228                                         } else
 229                                                 dbg("skip key '%s'", name_loop->name);
 230                                 }
 231                         }
 232                         rc = 0;
 233                 } else
 234                         dbg("parent not found in database");
 235                 udev_device_cleanup(udev_parent);
 236         }
 237
 238         return rc;
 239 }
 240
 241 #define WAIT_LOOP_PER_SECOND            50
 242 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 243 {
 244         char devicepath[PATH_SIZE];
 245         char filepath[PATH_SIZE];
 246         struct stat stats;
 247         int loop = timeout * WAIT_LOOP_PER_SECOND;
 248
 249         strlcpy(devicepath, sysfs_path, sizeof(devicepath));
 250         strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
 251         strlcpy(filepath, devicepath, sizeof(filepath));
 252         strlcat(filepath, "/", sizeof(filepath));
 253         strlcat(filepath, file, sizeof(filepath));
 254
 255         dbg("will wait %i sec for '%s'", timeout, filepath);
 256         while (--loop) {
 257                 /* lookup file */
 258                 if (stat(filepath, &stats) == 0) {
 259                         info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
 260                         return 0;
 261                 }
 262                 /* make sure, the device did not disappear in the meantime */
 263                 if (stat(devicepath, &stats) != 0) {
 264                         info("device disappeared while waiting for '%s'", filepath);
 265                         return -2;
 266                 }
 267                 info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
 268                 usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
 269         }
 270         err("waiting for '%s' failed", filepath);
 271         return -1;
 272 }
 273
 274 void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize)
 275 {
 276         char temp[PATH_SIZE];
 277         char temp2[PATH_SIZE];
 278         char *head, *tail, *pos, *cpos, *attr, *rest;
 279         int len;
 280         int i;
 281         int count;
 282         enum subst_type {
 283                 SUBST_UNKNOWN,
 284                 SUBST_DEVPATH,
 285                 SUBST_KERNEL,
 286                 SUBST_KERNEL_NUMBER,
 287                 SUBST_ID,
 288                 SUBST_MAJOR,
 289                 SUBST_MINOR,
 290                 SUBST_RESULT,
 291                 SUBST_ATTR,
 292                 SUBST_PARENT,
 293                 SUBST_TEMP_NODE,
 294                 SUBST_ROOT,
 295                 SUBST_SYS,
 296                 SUBST_ENV,
 297         };
 298         static const struct subst_map {
 299                 char *name;
 300                 char fmt;
 301                 enum subst_type type;
 302         } map[] = {
 303                 { .name = "devpath",    .fmt = 'p',     .type = SUBST_DEVPATH },
 304                 { .name = "number",     .fmt = 'n',     .type = SUBST_KERNEL_NUMBER },
 305                 { .name = "kernel",     .fmt = 'k',     .type = SUBST_KERNEL },
 306                 { .name = "id",         .fmt = 'b',     .type = SUBST_ID },
 307                 { .name = "major",      .fmt = 'M',     .type = SUBST_MAJOR },
 308                 { .name = "minor",      .fmt = 'm',     .type = SUBST_MINOR },
 309                 { .name = "result",     .fmt = 'c',     .type = SUBST_RESULT },
 310                 { .name = "attr",       .fmt = 's',     .type = SUBST_ATTR },
 311                 { .name = "sysfs",      .fmt = 's',     .type = SUBST_ATTR },
 312                 { .name = "parent",     .fmt = 'P',     .type = SUBST_PARENT },
 313                 { .name = "tempnode",   .fmt = 'N',     .type = SUBST_TEMP_NODE },
 314                 { .name = "root",       .fmt = 'r',     .type = SUBST_ROOT },
 315                 { .name = "sys",        .fmt = 'S',     .type = SUBST_SYS },
 316                 { .name = "env",        .fmt = 'E',     .type = SUBST_ENV },
 317                 { NULL, '\0', 0 }
 318         };
 319         enum subst_type type;
 320         const struct subst_map *subst;
 321
 322         head = string;
 323         while (1) {
 324                 len = -1;
 325                 while (head[0] != '\0') {
 326                         if (head[0] == '$') {
 327                                 /* substitute named variable */
 328                                 if (head[1] == '\0')
 329                                         break;
 330                                 if (head[1] == '$') {
 331                                         strlcpy(temp, head+2, sizeof(temp));
 332                                         strlcpy(head+1, temp, maxsize);
 333                                         head++;
 334                                         continue;
 335                                 }
 336                                 head[0] = '\0';
 337                                 for (subst = map; subst->name; subst++) {
 338                                         if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
 339                                                 type = subst->type;
 340                                                 tail = head + strlen(subst->name)+1;
 341                                                 dbg("will substitute format name '%s'", subst->name);
 342                                                 goto found;
 343                                         }
 344                                 }
 345                                 head[0] = '$';
 346                                 err("unknown format variable '%s'", head);
 347                         } else if (head[0] == '%') {
 348                                 /* substitute format char */
 349                                 if (head[1] == '\0')
 350                                         break;
 351                                 if (head[1] == '%') {
 352                                         strlcpy(temp, head+2, sizeof(temp));
 353                                         strlcpy(head+1, temp, maxsize);
 354                                         head++;
 355                                         continue;
 356                                 }
 357                                 head[0] = '\0';
 358                                 tail = head+1;
 359                                 len = get_format_len(&tail);
 360                                 for (subst = map; subst->name; subst++) {
 361                                         if (tail[0] == subst->fmt) {
 362                                                 type = subst->type;
 363                                                 tail++;
 364                                                 dbg("will substitute format char '%c'", subst->fmt);
 365                                                 goto found;
 366                                         }
 367                                 }
 368                                 head[0] = '%';
 369                                 err("unknown format char '%c'", tail[0]);
 370                         }
 371                         head++;
 372                 }
 373                 break;
 374 found:
 375                 attr = get_format_attribute(&tail);
 376                 strlcpy(temp, tail, sizeof(temp));
 377                 dbg("format=%i, string='%s', tail='%s'", type ,string, tail);
 378
 379                 switch (type) {
 380                 case SUBST_DEVPATH:
 381                         strlcat(string, udev->dev->devpath, maxsize);
 382                         dbg("substitute devpath '%s'", udev->dev->devpath);
 383                         break;
 384                 case SUBST_KERNEL:
 385                         strlcat(string, udev->dev->kernel, maxsize);
 386                         dbg("substitute kernel name '%s'", udev->dev->kernel);
 387                         break;
 388                 case SUBST_KERNEL_NUMBER:
 389                         strlcat(string, udev->dev->kernel_number, maxsize);
 390                         dbg("substitute kernel number '%s'", udev->dev->kernel_number);
 391                         break;
 392                 case SUBST_ID:
 393                         if (udev->dev_parent != NULL) {
 394                                 strlcat(string, udev->dev_parent->kernel, maxsize);
 395                                 dbg("substitute id '%s'", udev->dev_parent->kernel);
 396                         }
 397                         break;
 398                 case SUBST_MAJOR:
 399                         sprintf(temp2, "%d", major(udev->devt));
 400                         strlcat(string, temp2, maxsize);
 401                         dbg("substitute major number '%s'", temp2);
 402                         break;
 403                 case SUBST_MINOR:
 404                         sprintf(temp2, "%d", minor(udev->devt));
 405                         strlcat(string, temp2, maxsize);
 406                         dbg("substitute minor number '%s'", temp2);
 407                         break;
 408                 case SUBST_RESULT:
 409                         if (udev->program_result[0] == '\0')
 410                                 break;
 411                         /* get part part of the result string */
 412                         i = 0;
 413                         if (attr != NULL)
 414                                 i = strtoul(attr, &rest, 10);
 415                         if (i > 0) {
 416                                 dbg("request part #%d of result string", i);
 417                                 cpos = udev->program_result;
 418                                 while (--i) {
 419                                         while (cpos[0] != '\0' && !isspace(cpos[0]))
 420                                                 cpos++;
 421                                         while (isspace(cpos[0]))
 422                                                 cpos++;
 423                                 }
 424                                 if (i > 0) {
 425                                         err("requested part of result string not found");
 426                                         break;
 427                                 }
 428                                 strlcpy(temp2, cpos, sizeof(temp2));
 429                                 /* %{2+}c copies the whole string from the second part on */
 430                                 if (rest[0] != '+') {
 431                                         cpos = strchr(temp2, ' ');
 432                                         if (cpos)
 433                                                 cpos[0] = '\0';
 434                                 }
 435                                 strlcat(string, temp2, maxsize);
 436                                 dbg("substitute part of result string '%s'", temp2);
 437                         } else {
 438                                 strlcat(string, udev->program_result, maxsize);
 439                                 dbg("substitute result string '%s'", udev->program_result);
 440                         }
 441                         break;
 442                 case SUBST_ATTR:
 443                         if (attr == NULL)
 444                                 err("missing file parameter for attr");
 445                         else {
 446                                 const char *value = NULL;
 447                                 size_t size;
 448
 449                                 /* first try the current device, other matches may have selected */
 450                                 if (udev->dev_parent != NULL && udev->dev_parent != udev->dev)
 451                                         value = sysfs_attr_get_value(udev->dev_parent->devpath, attr);
 452
 453                                 /* look at all devices along the chain of parents */
 454                                 if (value == NULL) {
 455                                         struct sysfs_device *dev_parent = udev->dev;
 456
 457                                         do {
 458                                                 dbg("looking at '%s'", dev_parent->devpath);
 459                                                 value = sysfs_attr_get_value(dev_parent->devpath, attr);
 460                                                 if (value != NULL) {
 461                                                         strlcpy(temp2, value, sizeof(temp2));
 462                                                         break;
 463                                                 }
 464                                                 dev_parent = sysfs_device_get_parent(dev_parent);
 465                                         } while (dev_parent != NULL);
 466                                 }
 467
 468                                 if (value == NULL)
 469                                         break;
 470
 471                                 /* strip trailing whitespace, and replace unwanted characters */
 472                                 size = strlcpy(temp2, value, sizeof(temp2));
 473                                 if (size >= sizeof(temp2))
 474                                         size = sizeof(temp2)-1;
 475                                 while (size > 0 && isspace(temp2[size-1]))
 476                                         temp2[--size] = '\0';
 477                                 count = replace_chars(temp2, ALLOWED_CHARS_INPUT);
 478                                 if (count > 0)
 479                                         info("%i character(s) replaced" , count);
 480                                 strlcat(string, temp2, maxsize);
 481                                 dbg("substitute sysfs value '%s'", temp2);
 482                         }
 483                         break;
 484                 case SUBST_PARENT:
 485                         {
 486                                 struct sysfs_device *dev_parent;
 487
 488                                 dev_parent = sysfs_device_get_parent(udev->dev);
 489                                 if (dev_parent != NULL) {
 490                                         struct udevice *udev_parent;
 491
 492                                         dbg("found parent '%s', get the node name", dev_parent->devpath);
 493                                         udev_parent = udev_device_init(NULL);
 494                                         if (udev_parent != NULL) {
 495                                                 /* lookup the name in the udev_db with the DEVPATH of the parent */
 496                                                 if (udev_db_get_device(udev_parent, dev_parent->devpath) == 0) {
 497                                                         strlcat(string, udev_parent->name, maxsize);
 498                                                         dbg("substitute parent node name'%s'", udev_parent->name);
 499                                                 } else
 500                                                         dbg("parent not found in database");
 501                                                 udev_device_cleanup(udev_parent);
 502                                         }
 503                                 }
 504                         }
 505                         break;
 506                 case SUBST_TEMP_NODE:
 507                         if (udev->tmp_node[0] == '\0' && major(udev->devt) > 0) {
 508                                 dbg("create temporary device node for callout");
 509                                 snprintf(udev->tmp_node, sizeof(udev->tmp_node), "%s/.tmp-%u-%u",
 510                                          udev_root, major(udev->devt), minor(udev->devt));
 511                                 udev->tmp_node[sizeof(udev->tmp_node)-1] = '\0';
 512                                 udev_node_mknod(udev, udev->tmp_node, udev->devt, 0600, 0, 0);
 513                         }
 514                         strlcat(string, udev->tmp_node, maxsize);
 515                         dbg("substitute temporary device node name '%s'", udev->tmp_node);
 516                         break;
 517                 case SUBST_ROOT:
 518                         strlcat(string, udev_root, maxsize);
 519                         dbg("substitute udev_root '%s'", udev_root);
 520                         break;
 521                 case SUBST_SYS:
 522                         strlcat(string, sysfs_path, maxsize);
 523                         dbg("substitute sysfs_path '%s'", sysfs_path);
 524                         break;
 525                 case SUBST_ENV:
 526                         if (attr == NULL) {
 527                                 dbg("missing attribute");
 528                                 break;
 529                         }
 530                         pos = getenv(attr);
 531                         if (pos == NULL) {
 532                                 dbg("env '%s' not available", attr);
 533                                 break;
 534                         }
 535                         dbg("substitute env '%s=%s'", attr, pos);
 536                         strlcat(string, pos, maxsize);
 537                         break;
 538                 default:
 539                         err("unknown substitution type=%i", type);
 540                         break;
 541                 }
 542                 /* possibly truncate to format-char specified length */
 543                 if (len >= 0 && len < (int)strlen(head)) {
 544                         head[len] = '\0';
 545                         dbg("truncate to %i chars, subtitution string becomes '%s'", len, head);
 546                 }
 547                 strlcat(string, temp, maxsize);
 548         }
 549 }
 550
 551 static char *key_val(struct udev_rule *rule, struct key *key)
 552 {
 553         return rule->buf + key->val_off;
 554 }
 555
 556 static char *key_pair_name(struct udev_rule *rule, struct key_pair *pair)
 557 {
 558         return rule->buf + pair->key_name_off;
 559 }
 560
 561 static int match_key(const char *key_name, struct udev_rule *rule, struct key *key, const char *val)
 562 {
 563         char value[PATH_SIZE];
 564         char *key_value;
 565         char *pos;
 566         int match = 0;
 567
 568         if (key->operation != KEY_OP_MATCH &&
 569             key->operation != KEY_OP_NOMATCH)
 570                 return 0;
 571
 572         /* look for a matching string, parts are separated by '|' */
 573         strlcpy(value, rule->buf + key->val_off, sizeof(value));
 574         key_value = value;
 575         dbg("key %s value='%s'", key_name, key_value);
 576         while (key_value) {
 577                 pos = strchr(key_value, '|');
 578                 if (pos) {
 579                         pos[0] = '\0';
 580                         pos++;
 581                 }
 582
 583                 dbg("match %s '%s' <-> '%s'", key_name, key_value, val);
 584                 match = (fnmatch(key_value, val, 0) == 0);
 585                 if (match)
 586                         break;
 587
 588                 key_value = pos;
 589         }
 590
 591         if (match && (key->operation == KEY_OP_MATCH)) {
 592                 dbg("%s is true (matching value)", key_name);
 593                 return 0;
 594         }
 595         if (!match && (key->operation == KEY_OP_NOMATCH)) {
 596                 dbg("%s is true (non-matching value)", key_name);
 597                 return 0;
 598         }
 599         return -1;
 600 }
 601
 602 /* match a single rule against a given device and possibly its parent devices */
 603 static int match_rule(struct udevice *udev, struct udev_rule *rule)
 604 {
 605         int i;
 606
 607         if (match_key("ACTION", rule, &rule->action, udev->action))
 608                 goto nomatch;
 609
 610         if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel))
 611                 goto nomatch;
 612
 613         if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem))
 614                 goto nomatch;
 615
 616         if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath))
 617                 goto nomatch;
 618
 619         if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver))
 620                 goto nomatch;
 621
 622         /* match NAME against a value assigned by an earlier rule */
 623         if (match_key("NAME", rule, &rule->name, udev->name))
 624                 goto nomatch;
 625
 626         for (i = 0; i < rule->env.count; i++) {
 627                 struct key_pair *pair = &rule->env.keys[i];
 628
 629                 /* we only check for matches, assignments will be handled later */
 630                 if (pair->key.operation == KEY_OP_MATCH ||
 631                     pair->key.operation == KEY_OP_NOMATCH) {
 632                         const char *key_name = key_pair_name(rule, pair);
 633                         const char *value = getenv(key_name);
 634
 635                         if (!value) {
 636                                 dbg("ENV{'%s'} is not set, treat as empty", key_name);
 637                                 value = "";
 638                         }
 639                         if (match_key("ENV", rule, &pair->key, value))
 640                                 goto nomatch;
 641                 }
 642         }
 643
 644         if (rule->wait_for_sysfs.operation != KEY_OP_UNSET) {
 645                 int found;
 646
 647                 found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0);
 648                 if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH))
 649                         goto nomatch;
 650         }
 651
 652         /* check for matching sysfs attribute pairs */
 653         for (i = 0; i < rule->attr.count; i++) {
 654                 struct key_pair *pair = &rule->attr.keys[i];
 655
 656                 if (pair->key.operation == KEY_OP_MATCH ||
 657                     pair->key.operation == KEY_OP_NOMATCH) {
 658                         const char *key_name = key_pair_name(rule, pair);
 659                         const char *key_value = key_val(rule, &pair->key);
 660                         const char *value;
 661                         char val[VALUE_SIZE];
 662                         size_t len;
 663
 664                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 665                         if (value == NULL)
 666                                 goto nomatch;
 667                         strlcpy(val, value, sizeof(val));
 668
 669                         /* strip trailing whitespace of value, if not asked to match for it */
 670                         len = strlen(key_value);
 671                         if (len > 0 && !isspace(key_value[len-1])) {
 672                                 len = strlen(val);
 673                                 while (len > 0 && isspace(val[len-1]))
 674                                         val[--len] = '\0';
 675                                 dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 676                         }
 677
 678                         if (match_key("ATTR", rule, &pair->key, val))
 679                                 goto nomatch;
 680                 }
 681         }
 682
 683         /* walk up the chain of parent devices and find a match */
 684         udev->dev_parent = udev->dev;
 685         while (1) {
 686                 /* check for matching kernel device name */
 687                 if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel))
 688                         goto try_parent;
 689
 690                 /* check for matching subsystem value */
 691                 if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem))
 692                         goto try_parent;
 693
 694                 /* check for matching driver */
 695                 if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver))
 696                         goto try_parent;
 697
 698                 /* check for matching sysfs attribute pairs */
 699                 for (i = 0; i < rule->attrs.count; i++) {
 700                         struct key_pair *pair = &rule->attrs.keys[i];
 701
 702                         if (pair->key.operation == KEY_OP_MATCH ||
 703                             pair->key.operation == KEY_OP_NOMATCH) {
 704                                 const char *key_name = key_pair_name(rule, pair);
 705                                 const char *key_value = key_val(rule, &pair->key);
 706                                 const char *value;
 707                                 char val[VALUE_SIZE];
 708                                 size_t len;
 709
 710                                 value = sysfs_attr_get_value(udev->dev_parent->devpath, key_name);
 711                                 if (value == NULL)
 712                                         value = sysfs_attr_get_value(udev->dev->devpath, key_name);
 713                                 if (value == NULL)
 714                                         goto try_parent;
 715                                 strlcpy(val, value, sizeof(val));
 716
 717                                 /* strip trailing whitespace of value, if not asked to match for it */
 718                                 len = strlen(key_value);
 719                                 if (len > 0 && !isspace(key_value[len-1])) {
 720                                         len = strlen(val);
 721                                         while (len > 0 && isspace(val[len-1]))
 722                                                 val[--len] = '\0';
 723                                         dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val);
 724                                 }
 725
 726                                 if (match_key("ATTRS", rule, &pair->key, val))
 727                                         goto try_parent;
 728                         }
 729                 }
 730
 731                 /* found matching device  */
 732                 break;
 733 try_parent:
 734                 /* move to parent device */
 735                 dbg("try parent sysfs device");
 736                 udev->dev_parent = sysfs_device_get_parent(udev->dev_parent);
 737                 if (udev->dev_parent == NULL)
 738                         goto nomatch;
 739                 dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath);
 740                 dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel);
 741         }
 742
 743         /* execute external program */
 744         if (rule->program.operation != KEY_OP_UNSET) {
 745                 char program[PATH_SIZE];
 746                 char result[PATH_SIZE];
 747
 748                 strlcpy(program, key_val(rule, &rule->program), sizeof(program));
 749                 udev_rules_apply_format(udev, program, sizeof(program));
 750                 if (run_program(program, udev->dev->subsystem, result, sizeof(result), NULL, (udev_log_priority >= LOG_INFO)) != 0) {
 751                         dbg("PROGRAM is false");
 752                         udev->program_result[0] = '\0';
 753                         if (rule->program.operation != KEY_OP_NOMATCH)
 754                                 goto nomatch;
 755                 } else {
 756                         int count;
 757
 758                         dbg("PROGRAM matches");
 759                         remove_trailing_chars(result, '\n');
 760                         count = replace_chars(result, ALLOWED_CHARS_INPUT);
 761                         if (count)
 762                                 info("%i character(s) replaced" , count);
 763                         dbg("result is '%s'", result);
 764                         strlcpy(udev->program_result, result, sizeof(udev->program_result));
 765                         dbg("PROGRAM returned successful");
 766                         if (rule->program.operation == KEY_OP_NOMATCH)
 767                                 goto nomatch;
 768                 }
 769                 dbg("PROGRAM key is true");
 770         }
 771
 772         /* check for matching result of external program */
 773         if (match_key("RESULT", rule, &rule->result, udev->program_result))
 774                 goto nomatch;
 775
 776         /* import variables returned from program or or file into environment */
 777         if (rule->import.operation != KEY_OP_UNSET) {
 778                 char import[PATH_SIZE];
 779                 int rc = -1;
 780
 781                 strlcpy(import, key_val(rule, &rule->import), sizeof(import));
 782                 udev_rules_apply_format(udev, import, sizeof(import));
 783                 dbg("check for IMPORT import='%s'", import);
 784                 if (rule->import_type == IMPORT_PROGRAM) {
 785                         rc = import_program_into_env(udev, import);
 786                 } else if (rule->import_type == IMPORT_FILE) {
 787                         dbg("import file import='%s'", import);
 788                         rc = import_file_into_env(udev, import);
 789                 } else if (rule->import_type == IMPORT_PARENT) {
 790                         dbg("import parent import='%s'", import);
 791                         rc = import_parent_into_env(udev, import);
 792                 }
 793                 if (rc != 0) {
 794                         dbg("IMPORT failed");
 795                         if (rule->import.operation != KEY_OP_NOMATCH)
 796                                 goto nomatch;
 797                 } else
 798                         dbg("IMPORT '%s' imported", key_val(rule, &rule->import));
 799                 dbg("IMPORT key is true");
 800         }
 801
 802         /* rule matches, if we have ENV assignments export it */
 803         for (i = 0; i < rule->env.count; i++) {
 804                 struct key_pair *pair = &rule->env.keys[i];
 805
 806                 if (pair->key.operation == KEY_OP_ASSIGN) {
 807                         char temp_value[NAME_SIZE];
 808                         const char *key_name = key_pair_name(rule, pair);
 809                         const char *value = key_val(rule, &pair->key);
 810
 811                         /* make sure we don't write to the same string we possibly read from */
 812                         strlcpy(temp_value, value, sizeof(temp_value));
 813                         udev_rules_apply_format(udev, temp_value, NAME_SIZE);
 814
 815                         if (temp_value[0] == '\0') {
 816                                 name_list_key_remove(&udev->env_list, key_name);
 817                                 unsetenv(key_name);
 818                                 info("unset ENV '%s'", key_name);
 819                         } else {
 820                                 char *key_value = name_list_key_add(&udev->env_list, key_name, temp_value);
 821
 822                                 if (key_value == NULL)
 823                                         break;
 824                                 putenv(key_value);
 825                                 info("set ENV '%s'", key_value);
 826                         }
 827                 }
 828         }
 829
 830         /* if we have ATTR assignments, write value to sysfs file */
 831         for (i = 0; i < rule->attr.count; i++) {
 832                 struct key_pair *pair = &rule->attr.keys[i];
 833
 834                 if (pair->key.operation == KEY_OP_ASSIGN) {
 835                         const char *key_name = key_pair_name(rule, pair);
 836                         char attr[PATH_SIZE];
 837                         char value[NAME_SIZE];
 838                         FILE *f;
 839
 840                         strlcpy(attr, sysfs_path, sizeof(attr));
 841                         strlcat(attr, udev->dev->devpath, sizeof(attr));
 842                         strlcat(attr, "/", sizeof(attr));
 843                         strlcat(attr, key_name, sizeof(attr));
 844                         strlcpy(value, key_val(rule, &pair->key), sizeof(value));
 845                         udev_rules_apply_format(udev, value, sizeof(value));
 846                         info("writing '%s' to sysfs file '%s'", value, attr);
 847                         f = fopen(attr, "w");
 848                         if (f != NULL) {
 849                                 if (!udev->test_run)
 850                                         if (fprintf(f, "%s", value) <= 0)
 851                                                 err("error writing ATTR{%s}: %s", attr, strerror(errno));
 852                                 fclose(f);
 853                         } else
 854                                 err("error opening ATTR{%s} for writing: %s", attr, strerror(errno));
 855                 }
 856         }
 857         return 0;
 858
 859 nomatch:
 860         return -1;
 861 }
 862
 863 int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 864 {
 865         struct udev_rule *rule;
 866         int name_set = 0;
 867
 868         dbg("udev->dev->devpath='%s'", udev->dev->devpath);
 869         dbg("udev->dev->kernel='%s'", udev->dev->kernel);
 870
 871         /* look for a matching rule to apply */
 872         udev_rules_iter_init(rules);
 873         while (1) {
 874                 rule = udev_rules_iter_next(rules);
 875                 if (rule == NULL)
 876                         break;
 877
 878                 if (name_set &&
 879                     (rule->name.operation == KEY_OP_ASSIGN ||
 880                      rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 881                      rule->name.operation == KEY_OP_ADD)) {
 882                         dbg("node name already set, rule ignored");
 883                         continue;
 884                 }
 885
 886                 dbg("process rule");
 887                 if (match_rule(udev, rule) == 0) {
 888                         /* apply options */
 889                         if (rule->ignore_device) {
 890                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
 891                                 udev->ignore_device = 1;
 892                                 return 0;
 893                         }
 894                         if (rule->ignore_remove) {
 895                                 udev->ignore_remove = 1;
 896                                 dbg("remove event should be ignored");
 897                         }
 898                         if (rule->link_priority != 0) {
 899                                 udev->link_priority = rule->link_priority;
 900                                 info("link_priority=%i", udev->link_priority);
 901                         }
 902                         /* apply all_partitions option only at a main block device */
 903                         if (rule->partitions &&
 904                             strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {
 905                                 udev->partitions = rule->partitions;
 906                                 dbg("creation of partition nodes requested");
 907                         }
 908
 909                         /* apply permissions */
 910                         if (!udev->mode_final && rule->mode != 0000) {
 911                                 if (rule->mode_operation == KEY_OP_ASSIGN_FINAL)
 912                                         udev->mode_final = 1;
 913                                 udev->mode = rule->mode;
 914                                 dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel);
 915                         }
 916                         if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) {
 917                                 if (rule->owner.operation == KEY_OP_ASSIGN_FINAL)
 918                                         udev->owner_final = 1;
 919                                 strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner));
 920                                 udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner));
 921                                 dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel);
 922                         }
 923                         if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) {
 924                                 if (rule->group.operation == KEY_OP_ASSIGN_FINAL)
 925                                         udev->group_final = 1;
 926                                 strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group));
 927                                 udev_rules_apply_format(udev, udev->group, sizeof(udev->group));
 928                                 dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel);
 929                         }
 930
 931                         /* collect symlinks */
 932                         if (!udev->symlink_final && rule->symlink.operation != KEY_OP_UNSET) {
 933                                 char temp[PATH_SIZE];
 934                                 char *pos, *next;
 935                                 int count;
 936
 937                                 if (rule->symlink.operation == KEY_OP_ASSIGN_FINAL)
 938                                         udev->symlink_final = 1;
 939                                 if (rule->symlink.operation == KEY_OP_ASSIGN || rule->symlink.operation == KEY_OP_ASSIGN_FINAL) {
 940                                         info("reset symlink list");
 941                                         name_list_cleanup(&udev->symlink_list);
 942                                 }
 943                                 /* allow  multiple symlinks separated by spaces */
 944                                 strlcpy(temp, key_val(rule, &rule->symlink), sizeof(temp));
 945                                 udev_rules_apply_format(udev, temp, sizeof(temp));
 946                                 count = replace_chars(temp, ALLOWED_CHARS_FILE " ");
 947                                 if (count)
 948                                         info("%i character(s) replaced" , count);
 949                                 dbg("rule applied, added symlink(s) '%s'", temp);
 950                                 pos = temp;
 951                                 while (isspace(pos[0]))
 952                                         pos++;
 953                                 next = strchr(pos, ' ');
 954                                 while (next) {
 955                                         next[0] = '\0';
 956                                         info("add symlink '%s'", pos);
 957                                         name_list_add(&udev->symlink_list, pos, 0);
 958                                         while (isspace(next[1]))
 959                                                 next++;
 960                                         pos = &next[1];
 961                                         next = strchr(pos, ' ');
 962                                 }
 963                                 if (pos[0] != '\0') {
 964                                         info("add symlink '%s'", pos);
 965                                         name_list_add(&udev->symlink_list, pos, 0);
 966                                 }
 967                         }
 968
 969                         /* set name, later rules with name set will be ignored */
 970                         if (rule->name.operation == KEY_OP_ASSIGN ||
 971                             rule->name.operation == KEY_OP_ASSIGN_FINAL ||
 972                             rule->name.operation == KEY_OP_ADD) {
 973                                 int count;
 974
 975                                 name_set = 1;
 976                                 strlcpy(udev->name, key_val(rule, &rule->name), sizeof(udev->name));
 977                                 udev_rules_apply_format(udev, udev->name, sizeof(udev->name));
 978                                 count = replace_chars(udev->name, ALLOWED_CHARS_FILE);
 979                                 if (count)
 980                                         info("%i character(s) replaced", count);
 981
 982                                 info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name);
 983                                 if (strcmp(udev->dev->subsystem, "net") != 0)
 984                                         dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i",
 985                                             udev->name, udev->owner, udev->group, udev->mode, udev->partitions);
 986                         }
 987
 988                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
 989                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
 990                                         udev->run_final = 1;
 991                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
 992                                         info("reset run list");
 993                                         name_list_cleanup(&udev->run_list);
 994                                 }
 995                                 dbg("add run '%s'", key_val(rule, &rule->run));
 996                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
 997                         }
 998
 999                         if (rule->last_rule) {
1000                                 dbg("last rule to be applied");
1001                                 break;
1002                         }
1003
1004                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1005                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1006                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1007                         }
1008                 }
1009         }
1010
1011         if (!name_set) {
1012                 strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name));
1013                 info("no node name set, will use kernel name '%s'", udev->name);
1014         }
1015
1016         if (udev->tmp_node[0] != '\0') {
1017                 dbg("removing temporary device node");
1018                 unlink_secure(udev->tmp_node);
1019                 udev->tmp_node[0] = '\0';
1020         }
1021
1022         return 0;
1023 }
1024
1025 int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev)
1026 {
1027         struct udev_rule *rule;
1028
1029         dbg("udev->kernel='%s'", udev->dev->kernel);
1030
1031         /* look for a matching rule to apply */
1032         udev_rules_iter_init(rules);
1033         while (1) {
1034                 rule = udev_rules_iter_next(rules);
1035                 if (rule == NULL)
1036                         break;
1037
1038                 dbg("process rule");
1039                 if (rule->name.operation != KEY_OP_UNSET || rule->symlink.operation != KEY_OP_UNSET ||
1040                     rule->mode_operation != KEY_OP_UNSET || rule->owner.operation != KEY_OP_UNSET || rule->group.operation != KEY_OP_UNSET) {
1041                         dbg("skip rule that names a device");
1042                         continue;
1043                 }
1044
1045                 if (match_rule(udev, rule) == 0) {
1046                         if (rule->ignore_device) {
1047                                 info("rule applied, '%s' is ignored", udev->dev->kernel);
1048                                 udev->ignore_device = 1;
1049                                 return 0;
1050                         }
1051
1052                         if (!udev->run_final && rule->run.operation != KEY_OP_UNSET) {
1053                                 if (rule->run.operation == KEY_OP_ASSIGN || rule->run.operation == KEY_OP_ASSIGN_FINAL) {
1054                                         info("reset run list");
1055                                         name_list_cleanup(&udev->run_list);
1056                                 }
1057                                 dbg("add run '%s'", key_val(rule, &rule->run));
1058                                 name_list_add(&udev->run_list, key_val(rule, &rule->run), 0);
1059                                 if (rule->run.operation == KEY_OP_ASSIGN_FINAL)
1060                                         break;
1061                         }
1062
1063                         if (rule->last_rule) {
1064                                 dbg("last rule to be applied");
1065                                 break;
1066                         }
1067
1068                         if (rule->goto_label.operation != KEY_OP_UNSET) {
1069                                 dbg("moving forward to label '%s'", key_val(rule, &rule->goto_label));
1070                                 udev_rules_iter_label(rules, key_val(rule, &rule->goto_label));
1071                         }
1072                 }
1073         }
1074
1075         return 0;
1076 }